Stop mechanism.



G. L. BRINK.

STOP MECHANISM.

APPLIGATION FILED SEPT. 23, 1912.

Patented Mar. 16, 1915.

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13h] l @TATEg PATENT CHARLES I1. BRINK, OF LANSING, MIGHIG l\T.

STOP MECHANISM.

Application filed September 23, 1912.

T 0 all whom it may concern Be it known that 1, CHARLES L. BRINK, a citizen of the United States, residing at Lansing, in the county of lngham and State of Michigan, have invented a new and use ful Improvement in Stop Mechanism, of which the following is a specification.

My invention relates to bending machines and other similar devices, in which it is necessary to raise and lower a certain part of the machine through a fixed range of motion, and its purpose is to make a device that shall automatically perform the said operation and shall also be under complete control of the operator of the machine.

I attain these purposes by the means shown in the accompanying drawings, in which Figure 1 is an elevation of my device taken from the front showing the operating clutch unlocked, which is its normal position except when in process of raising and lowering the form, as will be more fully explained hereafter. Fig. 2 is an elevation taken from the right hand side, a part of the frame being removed to show the construction. Fig. 3 is an elevation of a part of the bender frame and form to show the connection of the device to the bender. Fig. 4 is a detail view illustrating a modified way of connecting the forming member with the operating mechanism.

Referring more particularly to the drawings, 1 is the main frame of a bender and 2 the form intended to be raised and lowered by my device. For the purposes of illustration 1 have chosen a machine of a well known type, but it is evident that my device might be applied to any form of bender, having a form adapted to be raised and lowered through a fixed distance or indeed to many other devices without departing from my invention, the only thing to be changed being the method of connecting the device to the part to be moved.

3 is the main frame of my device, which as shown, is attached to one side of the bender frame, but which might be secured in any desired position without departing from my invention. A shaft r is adapted to revolve in bearings 5 formed in the frame 3. A ratchet 6 is firmly secured to the shaft 1. This ratchet, however, it is unnecessary to provide with teeth except for a part of its circumference, since it always occupies substantially the same position at Specification of Letters Patent.

sure, engages with the Patented Mar. 16, 1915. Serial No. 721,928.

the termination of a stroke, and its purpose w1ll be more fully explained farther on. A pulley 7 and pinion 8 are mounted on a sleeve adapted to revolve freely on the shaft 4. This pinion drives a gear 9 also mounted on a sleeve carrying a clutch 10 and adapted to revolve freely on a shaft 11, which revolves in bearings 12, formed in the frame. The opposite half, 13, of the clutch is adapted to slide on the shaft 11, but compelled to revolve with it by a feather key or other similar device.

A spring 14 tends to force the jaws 10 and 13 of the clutch into engagement with each other, but they are normally retained out of engagement by a pin 15 operated by a foot lever 16, links 17 and 18 and bell crank lever 19. Manifestly any other suitable form of linkage might be employed according to the relative positions of gear and form. A cam 20 is formed in a sleeve 21, which is connected to the clutch jaw 13 and is preferably integrally formed with it. This cam 20 abuts against the pin 15, which. is normally kept pressed inward by a spring 22 so, as already stated, to prevent the members of the clutch engaging with each other. When, however, the pin 15 is drawn back by means of the foot lever 16, the sleeve 21 and jaw 13 are pushed forward and engage with the jaw 10 of the clutch so that the shaft 11 makes one revolution on its axis. When this revolution is completed the pin 15, which is immediately released after presinclined face 23 of the cam 20 and forces the sleeve and jaw back and out of engagement.

In order to prevent the shaft 11 from making more than a single revolution when released, a pin 3 1 is inserted between the sleeve 21 and the jaw 13 of the clutch, so as to engage with the pin 15 when a single revolution of the shaft is completed.

A pinion 24 is mounted on the shaft 11 and a gear 25 having a two to one ratio to the pinion 2 1, is mounted on the shaft 4. The ratio between the pinion and gear being in this instance one to two, one revolution of the shaft 11 will drive the gear 25 through half a revolution. lhe pinion and gear are so placed with relation to each other that when the gear 25 stops the pin 26 will stand substantially either in the position shown in Figs. 2 and 3 or one diametrically opposite to it, that is, so that the link 27, which con nects the pin 26 to the bell crank lever 28,

will be nearly on a center. Any other cycle might be obtained by a proper ratio of gears. The other extremity of the bell crank lever 28 is connected by a link 29 to a cam lever 30, which operates on the form 2 to force it downward. When the cam 30 is released the form 2 is raised by a spring 31. If, however, only a slight degree of pressure is required, the cam 30 might be dispensed with and the form 2 raised and lowered directly by the link 29 as shown in Fig. 4;. The ratchet 6 is so positioned on the shaft 4 with reference to the pin 26, that when the form 2 is pressed downward to its lowest point the teeth of the ratchet will be engaged by the dog 33 and the ratchet will thus be prevented from rebounding and revolving backward and thus releasing the pressure.

The operation of my device is evident from what has been already said in describing the construction. The pulley 7 being continuously driven from any suitable source of power, one pressure of the foot lever will cause the jaws of the clutch to engage and raise the form forthe insertion of a new piece to be bent. A second motion of the foot lever will again cause the jaws to engage and the gear 25 will make another onehalf revolution drawing the form 2 down against the article to be bent and retaining it there until released by another motion of the foot lever and another semirevolution of the gear.

I claim as my invention and desire to se cure by Letters Patent:

1. In a device of the class described, the combination of a shaft mounted for rotation, a clutch comprising a member adapted to revolve independently of the shaft, and a second member slidably mounted on the shaft for rotation therewith, said second clutch member being provided with a cam at one side thereof and with a portion extending transversely thereof, means for transmitting motion to the first mentioned member of the clutch, means for bringing the clutch members into engagement with each other, a pin movable into and out of engagement with the movable clutch memher, said pin being adapted to cooperate with the cam to move the sliding clutch member out of engagement with the other clutch member, said pin being also adapted to engage the said transverse portion of the movable clutch member to limit the rotary movement of the shaft. 1

2. In a device of the class described, the combination of a shaft mounted for rotation, a gear fixed on the shaft for rotation therewith, and provided with a crank pin, a drive pulley and pinion connected together and sleeved for rotation on. said shaft, a ratchet mechanism. associated with said shaft to prevent rotation thereof in one direction, a second shaft arranged parallel with the first shaft, a pinion fined on said shaft and engaging with said first mentioned gear and having a predetermined ratio thereto, a clutch on the second shaft, one member of the clutch being loosely mounted on the shaft and having a pinion connected thereto and in engagement with the pinion of the first shaft, the other member of the clutch being feathered on the shaft, means operatively connected with the crank pin to transmit reciprocatory motion, means for bringing said clutch members into engagement, and means acting automatically for disengaging said clutch members after a single revolution.

3. In combination, a gear having a crank pin mounted thereon; a pinion engaging with said gear and having a predetermined ratiothereto; a clutch having one member revolubly moimted on the shaft of 7 said pinion and the second slidably mounted on the said shaft so as to revolve therewith;

means for transmitting motion to the first member of said clutch; a mechanically operated pin acting on the second member of said clutch to prevent engagement of said members; a spring acting on said second member tending to force it into engagement with said first member, and automatically operated means comprising a cam mounted on said second member and adapted to engage with said pin, so as to separate said clutch members after a single revolution, and a second pin adapted to engage with said mechanically operated pin to stop the revolution of said pinion shaft after one revolution.

4:. In combination, a gear having a crank pin mounted thereon; a pinion engaging with said gear and having a predetermined ratio thereto; a clutch having one member revolubly mounted on the shaft of said pinion and the the said shaft so as to revolve therewith; means for transmitting motion to the revoluble member of said clutch; a mechanically operated pin acting on the second member of said clutch to prevent engagement of said members; a spring acting on said second member tending to force it into engagement with said first member; automatically operated means comprising a cam mounted on said second member and adapted to engage with said pin, so as to separate said clutch members after a single revolution; a second pin adapted to engage with said mechanically operated pin to stop the second slidably mounted on revolution of said pinion shaft after one a gear having a crank with said gear and having a predetermined ratio thereto; a clutch having one member revolubly mounted on the shaft of said pinion and the second slidably mounted on the said shaft so as to revolve therewith; means for transmitting motion to the first member of said clutch; a mechanically operated pin acting on the slidable member of said clutch to prevent engagement of said members; a spring acting on said second member tending to force it into engagement with said first member; automatically operated means comprising a cam mounted on said second member and adapted to engage with said pin, so as to separate said clutch pin adapted to transmit reciprocating motion.

CHARLES L. BRINK.

Witnesses:

H. L. LAWRENCE, PEARLE BOLU'ETT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents- Washington, D. G. 

